Ransomware Readiness
Gunra Ransomware: Backup Recovery Checklist for CISOs
Use the August 2026 Gunra advisory to review backup isolation, administrator access, restore tests, and recovery evidence in a practical CISO checklist.
Updated 2026-09-14 · 3 min read
Access review
Deletion rights
Identify every account that can delete recovery copies or change their retention settings.
Recovery test
Usable service
Require the application owner to verify a restored service, including its critical dependencies.
Leadership decision
Evidence gaps
Give each untested recovery assumption an owner and a review date.
Useful CyberPrism references
Joint Gunra Ransomware Advisory
August 10, 2026 primary advisory with observed activity, indicators, and mitigations.
CyberPrism RIPD Framework
Explore the framework for organizing threat activity and defensive context.
Threat Actor Intelligence
Review actor context when assessing a ransomware alert.
Vulnerability Trends
Follow vulnerability signals alongside your exposure review.
What should CISOs check first?
Check whether compromised production administrators could also delete backups, change retention, or control disaster recovery systems. Then request evidence that a critical service can be restored without relying on the compromised environment.
For a September 14, 2026 readiness review, the August 10 Gunra advisory provides a concrete scenario: attackers deleted backup and archived data at both a victim's primary data center and disaster recovery center. The advisory recommends tested offline, immutable backups in a separate, segmented location. [Joint Gunra advisory](https://www.ic3.gov/CSA/2026/260810.pdf).
Map who can control recovery copies
Ask infrastructure and identity owners to list the accounts, service credentials, and management consoles that control backup deletion and retention. Include emergency access accounts and outsourced administration.
Trace whether one compromised identity could reach both production and recovery administration. Treat that shared access as a remediation item even when the copies sit in different buildings.
Test a critical service end to end
Choose one business-critical service and restore it into an isolated test environment. Include the dependencies it needs to work: identity, configuration, certificates, application data, and required keys.
Record the recovery point, elapsed restoration time, missing dependencies, and the application owner's acceptance result. Compare the outcome with the business's agreed recovery targets; a completed backup job alone does not demonstrate service recovery.
Keep intrusion and data theft reviews open
Gunra uses both encryption and threats to publish stolen data. Recovering systems therefore addresses only part of the incident. [CISA's August 10 bulletin](https://content.govdelivery.com/accounts/USDHSCISA/bulletins/4244745).
Track restoration, attacker access, and possible data theft as separate workstreams. Ask investigators to document the period reviewed, available telemetry, and unresolved gaps before leadership treats the incident as closed.
Turn the review into a decision brief
For each critical service, report who owns recovery, which copy was tested, whether production credentials can control it, and which dependencies failed. Attach evidence and a completion date to each corrective action.
A useful update is specific: the application restored successfully, but emergency access still depends on the production identity system. That gives leadership a concrete gap to fund and assign.
FAQ
Does a separate disaster recovery site protect backups from ransomware?
Physical separation alone does not establish protection. Review shared credentials, management access, and deletion permissions, then test whether recovery remains possible when production systems are unavailable.
What evidence should a CISO request after a restore test?
Request the recovery point, elapsed restoration time, dependency failures, and application-owner acceptance. Include whether the team needed production identities or infrastructure that could be unavailable during an intrusion.
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